As an administrator you can apply permissions in bulk to users by using the bulk change feature.
Quick Steps
Click on settings in the left navigation menu
Select users
Select all the users you want to add, or remove, a permission to. Do this by selecting the empty block next to the user.
Click on the Bulk Change button
Select Set User Permissions
Select or deselect the permissions
Click Set permissions
If multiple users were selected, the permissions will be added or removed for all
