Don't manually alter the popups.ini file, rather, sue these steps.
1) Open the script editor (Alt + R)
2) Click the Pop-Ups tab
3) Select View - Nicklist
4) Add the items in this page.
5) Close the Script Editor (this will auto-save the changes you made)
Note that if you want the items available from more than one right click menu, I recommend using the menu prefix and placing them in the Remotes tab of the Script Editor.