You have to search for ProfilesX when you are in App Manager. You have to enable "extras-devel" repository first:

In the Application Manager:

1. Navigate to the application menu (tap the title bar)
2. Select ‘Application catalogs’
3. Select ‘New’
4. Enter a catalog name of ‘Maemo extras-devel’
5. Enter a web address of http://repository.maemo.org/extras-devel
6. Enter a distribution of ‘fremantle’
7. Enter components of ‘free non-free’
8. Select ‘Save’

Then you install ProfilesX.