Here you can find the guidelines for the third grant round and draft of application form.
It’s better to downolad the form and fill it before you apply, because you can do it just once, it’s impossible to save the application online.
Grant Round Guidelines: GCLS_Grant_Round_Guidelines
Application Form – draft: GCLS_Grant_Round_Application_Form
List of countries elegible for funding – GCLS_List of countries
SDG targets to select within the application – GCLS_SDG targets