Q: How do I deed my group to my land?
FIRESTORM At the top go to World>Parcel Details>General Tab> You will see Set on the right hand side, click it and select your group and click ok. select Allow Deed to group Then Deed will highlight, be sure to click it and deed the land to the group.
SL VIEWER Go to the land and right-click it. Select About Land from the pie menu. Click on the General tab. Click the Set button next to the Group name. A list of groups will appear. Select the group you want and click Set. Check the Allow Deed to Group box and click the Deed button.
Any Issues?:
If the group you deeded to land is deleted or you do not want that group set anymore you will need to contact and EM of the sim to help you fix it.
Useful information from SL Community Knowledge Base and SL wiki: