Make sure your butter is softened, if it isn't soft enough to mix try softening it for a few seconds in the microwave.
Finely chop all of the herbs.
In a small bowl mix the herbs into the butter until they are evenly distributed.
At this point you could transfer the butter to a small tupperware container with a tightly sealing lid.
OR you can take a small piece of wax paper or plastic wrap and lay it on the counter. Put the butter mixture in a blob on the center of the plastic wrap. Roll the butter into a log shape as best you can, then twist the edges of the wax paper or plastic wrap to seal.
This can be stored in the fridge, or stored in a Ziploc bag in the freezer for up to 6 months. Sometimes I make a big batch and freeze several that I can pull out on busy weeknights to top our meat or veggies.