You may apply on the NBA platform or the NBA Branch close to you.
Note that you may have to undergo verification first. They would be requiring some documents including your call to bar certificate, identity card and the likes.
REQUIREMENTS FOR STAMP REQUEST ONLINE ARE:
• Payment of Bar Practice Fees for the current year.
• Payment of branch dues.
• Evidence of change of Name (If Any)
• Payment for number of Stamps needed
Upon successful completion, the stamp would be issued via the branch you picked.