i cant open links from the wallet.
No one can. Its a security measure in the wallet right now. In order to open links, the wallet would need additional access rights to your computer to open other programs (ie: internet browser)
What is the GRWI Token for? What are the usecases?
Read the white paper (green paper)
http://growersintl.com/Growers_International_Greenpaper_v1.pdf