What is the ruling on posting beneficial topics in mixed forums, given the possibility of hiding women's profile pictures in comments? And will I be held responsible for their violations of the regulations after I have warned them? And is it permissible for me to answer their questions in a general manner?

It is permissible to subscribe, write, and comment in general forums for men and women if it is for a beneficial purpose and does not lead to any religiously forbidden acts, provided that certain guidelines are adhered to, including: not posting inappropriate images, not delving into matters that incite desires, and avoiding private conversations between men and women. It is preferable for men to participate in forums designated for men, and for women to participate in forums designated for women. If images of women appear, it is obligatory to lower the gaze, and it is preferable to block them. The forum administrator must prevent any reprehensible content. On private pages on Facebook, objectionable content must be blocked. As for images of women that appear as comments on a post and cannot be blocked, there is no blame on you, and it is obligatory for those who see them to lower their gaze.