Hello,
To install the code, you need to follow carefully the steps described on this section
www.opentelemac.org/index.php/installation. It will depend on which OS you're working, you need parallelism or not, etc.
To start using the code, the easiest way is to start by the validation cases, that you will find when downloading each code with SVN. Furthermore, there are a complete set of documents that help you increase your skills. The most useful document is the user manual. Eventually, you find a lot of answers for a wide range of questions on the forum.
I think that the idea of screenshot presentations is interesting and helps a lot new users especially for the installation step.
I hope that it was helpful,
My best regards
Riadh Ata