You can edit your author profile in the Blog > Authors section in your HubSpot account:
Please choose a square photo (equal width and height. e.g. 256x256px) so it can automatically be styled to a perfect circle:
There is no field for a blog author title in HubSpot, but for Act2 Blog II template you can split your Author Bio text by a vertical bar with white spaces before and after |
What is on the left will appear as the author title:
And what is on the right will appear as the author bio text: