Please explain your problems so we can help instead of posting a general subject and beating around the bush and making us guess...Most of my troubles are with the solder melting to the other rails.
What is the "right" solder?Be sure you're also using the right solder.
A clean board will help a lot. Also you need a fine tip soldering iron, and it really helps to have a plunger type desolderer (solder sucker) to remove the excess solder from the stripboard.Most of my troubles are with the solder melting to the other rails.