This is the 1884th most frequent Japanese word.
申し込み
Application; request; subscription.
In this sentence, '申し込み' (うけつけ: application) is used to refer to the act of applying or signing up for a membership.
新しいジムの会員申し込みをしました。
I signed up for membership at the new gym.
Here, '申し込み' represents the act or process of registration or application for an event.
このセミナーへの申し込みは、来週までできます。
You can apply for this seminar until next week.
'申し込み' in this case means applying or expressing interest in participating in an organization or activity, specifically volunteering.