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In order to register members to a specific association for one or more players, you can go Competition participation --> Players -->Registration Manager. Upon person filter list as below image, you can sort out person you want to manage membership status, de-register or register using various search criteria: role, name/ID, type of registration etc. And remember to choose the target association to member with.
In this instance, "No type" under registration drop down list has been chosen, which will display all people who has not registered to any association at all. The range of registration type options varies depending on offer configured at the discretion of the parent associations. Now we will proceed to turn these "no type" into the registered.
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Important notes: Registration type will relate with DOB therefore range of ages must meet the configured requirements by parent organization. Otherwise, error notice will appear.
3. What happens next?
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What information are you seeing?
Referring to the above 2. How do I manage or register for players? for more details what criteria used for searching and how to register or de-register.