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$\begingroup$As you can see in the revision history and in the timeline, the linked question is protected. Only users with reputation at least 10 can answer such questions - but I don't assume this is a problem in your case. When I scroll to the bottom of the page, I can click on answer this question button and after that, the answer box appears. (I am on a desktop - I did not check from a mobile device.)$\endgroup$
$\begingroup$@MartinSleziak I have again the same problem via desktop. I do not find an answer box or answer this question button. I would appreciate if you help me$\endgroup$
$\begingroup$@MartinSleziak Yes I see I forgot my meta question you linked too. any way I would appreciate if you help me to remove this problem(if it is possible for you)$\endgroup$
$\begingroup$I don't really know any other way how to resolve this than earning enough reputation points to get above the threshold. (Possibly some user with sufficient reputation could unprotect the question. But I assume they were reasons for protecting the question - so maybe it is better if it remains protected.)$\endgroup$