Your "About me" section on your profile is a powerful tool to advertise yourself to prospective clients. Giving clients some background on who they will be meeting with creates a nice personal touch and allows for clients to pick their best match.
Here are some topics you might want to consider working into your "About me":
Work-Related:
Overall experience
Number of years practicing
Areas of interest
Niche areas
Personal:
Your own pets
Hobbies/interests
To write your "About me" navigate to your account settings and select Personal Information.