The design is the visual features of the POST FOR FURNITURE shown in the drawings, whether those features are features of one of shape, configuration, ornament or pattern or are a combination of any of these features. Variants are included.Drawings of the design are included in which:Figure 1 is a perspective view of the Post for Furniture in accordance with the present design with the front and right sides being shown therein;Figure 2 is an elevation view of the left side of the Post for Furniture shown in Figure 1;Figure 3 is a rear elevation view of the Post of Furniture shown in Figure shown in Figure 1;Figure 4 is a top plan of the Post of Furniture shown in Figure 1;Figure 5 is a perspective view of a variant of the Post for Furniture in accordance with the present design with the front and right sides being shown therein;Figure 6 is an elevation view of the left side of the Post for Furniture shown in Figure 5;Figure 7 is a rear elevation view of the Post for Furniture shown in Figure 5;Figure 8 is a top plan of the Post for Furniture shown in Figure 5;Figure 9 is a perspective view of another variant of the Post for Furniture in accordance with the present design with the front and right sides being shown therein;Figure 10 is an elevation view of the left side of the Post for Furniture shown in Figure 9;Figure 11 is a rear elevation view of the Post for Furniture shown in Figure 9;Figure 12 is a top plan of the Post for Furniture shown in figure 9;Figure 13 is a perspective view of yet another variant of the Post for Furniture in accordance with the present design with the front and right sides being shown therein;Figure 14 is an elevation view of the left side of the Post for Furniture shown in Figure 13;Figure 15 is a rear elevation view of the Post for Furniture shown in Figure 13;Figure 16 is a top plan view the Post for Furniture shown in Figure 13;Figure 17 is a perspective view of yet another variant of the Post for Furniture in accordance with the present design with the front and left sides being shown in figure therein;Figure 18 is a front elevation view of the Post for Furniture shown in Figure 17;Figure 19 is an elevation view of the right side of the Post for Furniture shown in Figure 17, the left side and rear being the same;Figure 20 is a top plan of the Post for Furniture shown in figure 17;Figure 21 is a perspective view of still yet another variant of the Post for Furniture in accordance with the present design with the front and left sides being shown therein;Figure 22 is a front elevation view of the Post for Furniture shown in Figure 21;Figure 23 is an elevation view of the right side of the Post for Furniture shown in Figure 21, the left side and rear being the same;Figure 24 is a top plan of the Post for Furniture shown in Figure 21;Figure 25 is a perspective view of still yet another variant of the Post for Furniture in accordance with the present design with the front and right sides being shown therein;Figure 26 is an elevation view of the left side of the Post for Furniture shown in Figure 25;Figure 27 is a rear elevation view of the Post for Furniture shown in Figure 25;Figure 28 is a top plan of the Post for Furniture shown in Figure 25.