At the top right are three icons sitting under the front tire of the pictured Roadster.
The first is a head & shoulders silhouette. Click it.
That will open a new page that has a list of activities that run down in a column at the left side of the page.
The third section title down is "Settings". Click on the first name, "Personal Details".
Near the top of the page is a place to add or change your avatar and custom title.
Further down is a box entitled "Location:" where you may enter your location.
Close to the bottom is a box entitled "Ride:" where you may enter your year and model motor.
There are other useful options on the page as well.
Have fun!