Privacy settings.iPhone

I installed the keek app on my iphone and went to add a profile pic on it when it asked to access my photos. My accident I pressed no! Now it keeps saying I need to change my privacy settings to put a profile pic up.

I went to settings. Privacy on my iPhone but keek is not showing up there. I've tried deleting the app and reinstalling it but that doesn't work. Also turned my phone off and on but nope.

Ok this is simple.
Have the keek app on your phone.
Now go to settings>>privacy>>photos

There should be a list of apps that can access your photos (facebook, twitter etc)
Look for keek and turn the tab beside it to 'on'

Hope this helped.