How do I tell others what Jesus has done for me?

It doesn't need to be complicated. Whenever you have the opportunity, simply tell someone how grateful you are that Jesus took all your sins away. Tell them about how Jesus has changed your life and how He continues to change your life.

You don't have to say everything perfectly. The power is not in the words you say but in Jesus Himself. You simply need to present Jesus to whoever you're talking to.