Step 1.
Log in to your PayPal account.
On «My Account
» tab select «Profile
» → «More Options
» from the top menu.
Step 2.
The «My Profile
» screen will be opened.
Select «My selling tools
» from the left sidebar:
Step 3.
On «Selling online
» section click «Update
» in «PayPal buttons
» row:
Step 4.
The «My Saved Buttons
» screen will be opened.
Click «Create new button
»:
Step 5.
The «PayPal Button Manager
» will be opened:
Step 6.
Design your button.
When you have finished, copy an autogenerated code to clipboard, and paste it in Discourse admin panel in PayPal «Buy Now» plugin field.