You should be able to select the Refund Advance option in the Your refund info step of the File section. If you have already filed, you will not be able to go back and select it. If the option is not available to you then it means you were not selected.
Please refer to the help article below.
About the Refund Advance application process - Community
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"