how do i add homebrew twilight menu to my dsi without making it start with the twilight menu everytime i boot the system, i want a option to press like an app on the main menu to take me there
To have TWiLight Menu++ on the official DSi Menu you'll need to use hiyaCFW, to install it to hiya just copy the title folder from the TWiLightMenu-DSi.7z if you haven't already.
Alternatively you can also set it to the A/B/X/Y hotkey in Unlaunch and set NO BUTTON to Launcher, then it'll load the official DSi Menu by default but you can boot while holding a button for TWiLight.