For comments on any of the Official Memrise Japanese Courses, it is best to post them on the official forum of the Japanese course: [Course Forum] Japanese 1-7 by Memrise
and to tag KanaTsumoto (symbol “@” + “KanaTsumoto”), who is the Japanese Language Specialist at Memrise.
It is also good to put as much information as possible by adding the link of your course. In your case, you are learning the Japanese 1 course for British English speakers: https://www.memrise.com/course/2022732/japanese-1/
and the problem appears at level 13.
If it is suggestions about the official Japanese course, it is better to post in the official forum. But if it’s something general, you can choose which one fits your topic best by looking in the left column of the Forum. You can see in the left column that the subject is divided into Memrise (official courses) and Decks (courses created by the community).
As for closing the topic, I do not have that “power”. Only a moderator of Memrise, or a user who has reached the category of “leader” can close.