A great profile picture is a must on your own blog! It’ll not only appear next to your author name on posts, it’ll show up next to comments you make on your blog and on some other blogs.
Login to your wordpress admin and click the profile picture in the top left then click Edit My Profile.
Scroll down on the profile editor until you see the Profile Picture option. Click the link to Gravatar.
Click on the Sign In button.
Click Authorize to use wordpress to login to gravatar.
On the Manage Gravatars screen click Add a new image.
Click Upload New.
Click Choose File.
Navigate to your profile picture on your computer, highlight it and click Open.
Adjust your photo using the controls and the anchors on the transform box. Once you’re happy with your profile picture click Crop Image.
Select a rating for your image then click Set Rating.
If you want to upload more images then click the Add a new image link and repeat the upload process.
It might take a while for your profile picture to update in wordpress but this is usually down to your browsers caching. Either clear the cache or check using a different browser/from a different device.