To take a picture with the FM-7810, use the number 5 on the keypad. To view the picture, go to Multimedia > Picture viewer > Options > View. 

To switch to another picture in the picture viewer, use the hash and star.

To link a photo to a contact, go to Phonebook in the menu, then Photo Contacts and OK, use the arrow keys to go to a green box with a + and press Add. For 1Photo select a photo from the file and for 2Contact enter a name and with the arrow down enter a phone number. Then press Save and a photo contact is created.