I'm no expert, Stanron, but will that stop me sharing my opinion? Will it, hell!

If your coffee consistently tastes like mud, one possibility is that you are using an inferior blend of coffee. You might try experimenting until you find a blend that works for you.

It could be, however, that your coffee beans aren't entirely fresh. Perhaps they have been sitting around too long, and not in a dry, airtight container. Coffee beans should not be kept in the fridge or freezer, either.

Perhaps the problem is the grind. A French press requires a coarse grind. Finely ground coffee, which is what you would need for a Melitta filter coffee maker, would not work well in a French press.

Don't be skimpy with the coffee. You need two generous coffee measures per cup in my humble, but nevertheless correct, opinion.