Welcome! This forum has a treasure trove of great info – Scouters helping Scouters! Just a heads up, though - all content, information, and opinions shared on this forum are those of the author, not the BSA.
@JosephDi_Toro - in order to be a leader you would need to complete a leader application either on-line or the paper application depending upon unit/council/state requirements. In applying you would need to note the BSA ID that you have from my.scouting.org.
Before, you just had a Scoutbook account. You were not a registered leader. To be registered leader you have to logon to my.scouting, take Youth Protection Training. After taking the training, you will get via email a pdf certificate indicating you are done and it is recorded in the system. Then either use the online registration found via beascout.org (if your unit and council allow) or get a paper/pdf version of the application. If doing paper, you will also sign a criminal background check form (called a CBC). Take the application, the CBC, and your YPT certificate and turn it into your unit. Your Cubmaster can get it to your Committee Chair who can get it to your Chartered Organization Rep. Assuming they approve of you being a leader, they will send it in for processing. All of that may be able to be done electronically if, again, your unit/council allow it.