I've took some screen shots to help learn how to do this.
I hope this will help you.
Step one
Step two ( you can select from witch crypto you want to transfer to steem)
Step three (where you see etcbits enter your steemit name then click on Get a new deposit adress)
Steep four (send it to the address generated for example send litecoin to this address scan or copy the wallet address then send)
If you have any question I'm here to help!
Ps don't scan the wallet in this post.
Fallow Here https://steemit.com/@etcbits