Hello please help I can neither add friend nor upload pictures

Welcome. First, try writing on your profile page and join the forums.
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Second,

Add a new photo
Photo Guidelines

No suggestive photos, nudity, or obscene gestures
No disturbing images or images of illegal activities
No copyrighted material
You should be in all photos
Photos should be in .gif, .jpg, or .bmp format
Make sure the file size of the photo is not too large or it will not upload properly

If you are attempting to upload from a pc:
http://mingle2.com/user/edit_photos
If you are trying with a mobile device:
http://m.mingle2.com/users/edit_photos

And if having difficulties, try a different browser.
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And THIRD,
Friends Requests

The 'invite' word that appears is actually a link. if you click on it, you will see who requests your friendship, and the option to accept/decline.

http://mingle2.com/invitations/list
As klc said, next to your 'Mail', next to your picture
on your 'Account' page, and with red bracketing, are
your friend invitations.

To 'make a 'Friend Request' you would go to their profile
and click on the orange link beneath their picture
'Add as Friend'.

You will be given the option to add a message.

You also have the option of your Friends list showing
on your profile, or not showing, same with Testimonials:
http://mingle2.com/user/edit_profile
(>>>Account>>>Edit profile>>>Show/don't Show Friends/Testimonials.)
It is on the lower right of the edit profile page.

Testimonials can only come from those on your Friends list.