main menu bar –> Place –> Place the footprint anchor (also available as icon on the right toolbar).
Instead of that specialized tool I use the generic tools: select all (CTRL+A), then use the new anchor (your pad1) and move the complete selection with that pad as grabbing point to the 0,0 location.
If the part is a surface mount part, you may want the anchor in the center of the part. Depends on your assembly house, but most want the center of the part which is where the part is “picked” up to be “Placed”