Some projects will not require you to confirm your participation and will be open for all NFT holders. In this case, you don’t need to do anything. :)
For other projects, you will be asked to confirm your participation beforehand. All the information about this can be found on the launchpad in the project details.
You can see all the necessary dates related to the project here:
And when you go to your NFT , you will see a button saying 'confirm'
All you have to do is to click on the button.