Its very easy. Just you need to add authors to your blogger blog. Steps: Login to your blogger blog Go to settings - permissions Click on add authors That's it. You may add upto 100 authors. Hope this helped you.
just give some invitation to user that you want,.. but don't make him an admin,. just a writter hope that usefull regard's
Okay since noone has really given you a step by step run down on how to do this let me help you. Step 1: Create them an account Step 2: Then set their permissions to Author. This will allow them to login and post. I hope this helps you out!