To change your personal options, on any screen find your personal icon in the top-right corner.
Click the icon to view the dropdown screen. Select Account Settings.
The first section offers an interesting blend of configurable options.
If you hover over the image (or its placeholder) you will find that it is clickable You may click it to upload a photo, or just drag and drop your image file right atop the avatar.
The other options should be fairly clear, except the searchability checkboxes near the bottom.
Being searchable globally means that all TCP users will find you on a global search. This is the right setting for those who may be involved with projects outside their own organization, including those led by consultants.
Being searchable from users within our company means that people within your organization will find you in their list of potential project resources. There is really no reason to deselect this option unless you purposely want to be invisible.