The reputation access levels are there to make sure you have some time to learn about the site before you start getting access to the tools. For example learning which questions should be closed, edited, opened is something that experienced users still have debates about to this day.
If you stay active writing answers and questions and reading the site then over time your reputation will increase and you will get access to more and more tools. You can already join the chat room, soon you will be able to add comments.
You should already be able to edit posts, removing typos. Cleaning up English, improving formatting. Be careful not to change the meaning of posts but we can all help make the posts as good as they can be.
As your reputation increases you will then get access to the review queues, which is your next chance to contribute. Checking whether questions should be open or closed, checking whether edits are appropriate, etc.
This site is run by the community, for the community. We ease people in gradually but welcome to your first steps :)