Profiles with Pictures attached get over 7x the response than profiles without. You may add up to 10 pictures to your profile.
Once you sign in on your member page, go to "My Profile" and Add Photos. You then go to where it says, "Upload your photo"; click on the arrow there. Click on browse and select the photo from your files in your computer, where you have it saved. Then click "upload". You can then add a description of your photo underneath each photo as it is uploaded. Be sure to do it at the time you upload the photo as you may have to delete and upload the photo again later if you decide to add or edit a description.