Is it permissible for me to advise on knowledge that I have not acted upon, and does that fall under the warning, "Whoever conceals knowledge, Allah will bridle him with a bridle of fire on the Day of Resurrection"?

It is permissible to teach others beneficial knowledge, as teaching people what benefits them in their religion and worldly affairs is part of the required advice. Advising the general Muslim populace includes teaching them matters of their religion and worldly life, even if the person does not act upon what they teach. This is because a person's failure to act upon what they know does not exempt them from advising others. It is not a condition for enjoining good and forbidding evil that the person acts upon what they know. However, for one who enjoins good but does not do it, and forbids evil but commits it, severe warnings have been issued. If the knowledge is from the religious sciences, then it is obligatory to teach those whom you are appointed to teach and to answer those who ask you; for the Prophet, peace and blessings be upon him, said: "Whoever is asked about knowledge and conceals it will be bridled on the Day of Resurrection with a bridle of fire."