For those in a hurry, you can view this section "First steps":
It contains a summary of the most important things. Based on a step-by-step explanation the path from registration to part download is explained.
A lot of important and interesting information is contained in the rest of the sections so that we recommend you read these as well.
If you want to get all information and not have to read things twice, continue at Section 1.4, “Main menu before logging in - Register Activate ”.