Based on documentation from community sources like Aimcop , the general process for using this menu involves:

: Version 1.61 is severely outdated. Using an old menu on a newer game version will likely lead to an immediate crash or a "detected" flag by Rockstar's anti-cheat.

: Using any mod menu in GTA Online violates Rockstar's Terms of Service and carries a significant risk of a permanent account ban.

: Launch GTA 5 into Story Mode first. Once loaded, use the launcher to "Inject" the menu. Controls : Open Menu : Press the Insert or F4 key.