Step 1: Click on the Skillset Tab
You will see the following screen.
You will see three columns, Skill, Qualified, and Favourite.
Step 2: Check the boxes of the skills you are qualified for, if that skill happens to be your favourite, check the box under the Favourite column to increase your ranking in searches.
Please remember the more you respond to requests the higher your rating will be which increases your chances of receiving requests.