Can’t choose ‘which board on new topics page’ + the page ‘new topics’

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Hi.
I have made a fine forum page with multiply users with disc. boards, but I still seams to have 2 problems:

1) On the page “New topics” I can’t choose any boards? The only receiving message when trying to do so, is ‘select boards’ ?
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2) My topics page does not look fine and I like to make it look alike else pages within forum.
– What I would like to ask: is there any methods to change layout of “url/discussion-topics/” ? in discussions boards settings on wp-dashboard or alike?

Further speaking on this topic:
I see on those pages underneath, that you can add “filter hooks”, but because I have no experience in coding and alike, therefore I won’t like to interfere with that.
Page 1) https://wordpress.org/support/topic/change-discussion-topics-url/
Page 2) https://developer.wordpress.org/reference/hooks/register_post_type_args/
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