Line the broiler pan with some foil and spray the top rack of the broiler pan with Pam or something to make the clean-up a bit easier.
Brush the tops of the salmon steaks with a bit of melted butter and put them under the preheated broiler for about 5 minutes per side (for 3/4" thick steaks). While they're broiling mix the rest of the melted butter with the herbs, salt, pepper and lemon juice.
About a minute before the salmon is cooked through, pour the rest of the flavored butter over it and then continue broiling. The classic description is "the salmon is done when it flakes easily with a fork." That may sound daunting if you're new, but it's true! Take a fork and poke at the fish a bit. If it falls apart easily, it's done.