In the event, you are not available for the draft for a contest you have entered you have the ability to set the priority for the auto-drafting of the first pick for your roster. After this pick, it will revert back to auto-drafting based on highest projected points. The position you select will become the default priority for all contests you enter in that sport going forward. Unless you go change the setting again.
The choices are based on projected points and position.
In the example below, you will see the choices for NBA.
It is recommended that you select your preference before joining the contest based on your specific strategy for drafting.