Have new laptop. Despise the way cursor jumps around on it's own. Way too fast. Don't know how to slow it.HELP

I got new wireless mouse which I love but the cursor still jumps around like crazy & decides to highlight stuff on it's own so I lose lots of messages I write. I'm pretty computer illiterate but I've looked all around on the computer settings, etc, but nowhere do I see where I can adjust the speed of the cursor. Can anyone help me?