It looks like the account that you are logging in with isn't the main admin account. It's probably a developer account to which the admin has added the ability to make backups and tweak Google Analytics settings. You'll need to contact the admin and ask them to give you full privileges, in order to install packages yourself.
If you have FTP access to the website, there is a way to move an account from one group to another:
Open: ~/App_Data/Composite/DataStores/Composite.Data.Types.IUser.xml
Find the user account for the user you want to change group membership for, and make a note of the Id GUID value.
Open: ~/App_Data/Composite/DataStores/Composite.Data.Types.IUserGroup.xml
Find the group you want that account to have membership of (ie: Administrator or Admin), and make a note of the Id GUID value.
Open: ~/App_Data/Composite/DataStores/Composite.Data.Types.IUserUserGroupRelation.xml
Make a backup copy of this file, just in case it doesn't work!
In the origional, find UserId GUID matching your account Id, then ammend the UserGroupId to the group Id. Save the file.
I've tried this out on my local copy of C1 and it appears to work. You should now have access to everything the admin has access to.