How can feelings of love and care be expressed to an anonymous person on a religious forum?

If the admiration is a result of the man's presentation of good, then there is no sin in it, and it is hoped that it will enter into the love of Allah, while observing Allah and being cautious of the relationship developing into something forbidden. This love should not be declared to the young man, as it is an entryway for Satan. If you mean another kind of love, then the matter is of greater danger. Generally, do not initiate a relationship with any young man except within the permissible Islamic limits, and if you desire him for marriage, then communication should be through one of your mahrams.