Once you have a drawing open in the Design Center palette, you are all set to insert a block. Follow these steps to insert the blocks from the Design Center into the drawing:

1. Select the block from the palette, then drag and drop it in the drawing area.
2. The block will be added in its original scale, and if you find it is too large or small for your drawing you can use the scale command to make it bigger or smaller.
3. To insert these blocks with more options, double-click or right-click on the block and select Insert Block from the Context menu.
4. You will now see the Insert window, which has options such as Scale and Rotation angle, and then click OK to insert the block.

Once you insert the block from Design Center to your drawing, the block will be added to the local library of blocks as well, and you no longer need to go to the Design Center to insert the block again. You can now go to the Insert block option of the Block panel to insert the same block.