To access Campaign (PC760), user account must have the Campaign Management (PC760) permission, which is displayed under CSR Setting in user's group setting screen. Once you see Campaign Management (PC760) at left panel, you can able to see other 3 sub items Create New Campaign (PC761), View All Campaign List (PC762), Attach Customer To Campaign (PC763) in left panel under Campaign Management (PC760). But to access all these, user must have the group permissions PC760, PC761, PC762 and PC763.

The image below is showing the all group permission PC760, PC761, PC762 and PC763 which should be allowed for your user's group.