Collabora setup and settings

I am a curious and novice user. I installed nextcloud. but I have not activated collabora for 1 month. I installed nextcloudu through ubuntu applications. I said download the next application from the nextcloud collabora and I could not do anything else. how can you help. I give money whatever

@Mustafa_Pisirici maybe it helps reading this page: https://nextcloud.com/collaboraonline/
Starting from the section โ€™ Getting started in 3 stepsโ€™ you should be able to get it working.

Do you mean by this that you installed the Collabora app within Nextcloud? If so, all you have installed is the Collabora client and not the Collabora server.

then do I install collabora server on the same computer?