You can create player profiles for players from the 'Team Squad' page for a team that the player is on.
Click on the 'Manage' button next to a division from Admin Home, then click on the link 'Manage Team Squad' for that team, then find the person and click on the Player Profile link next to their name.
There you can upload an image and add text content.
You can also upload more images to display on their page in:
Site Builder > Media > Images
then tag the image to the player after uploading.
You can also create news items that show on their page in:
Site Builder > News
then tag the news report to the player.