In order to set up a telegram joiner for free, you will need:
1) In the left menu of the program, click on the " Join groups (Joiner) " button (point 1 in the screenshot)
2) Specify the list of invitation links to the desired groups in the "List of invitation links" field (Point 2 on the screenshot). Each link must be on a new line.
3) Click " Start Intro " (item 3 on the screenshot).
After that, the program will start joining the groups one by one according to the invitation links you specified. The result of the intros will be published in the " Intro log " field (item 4 on the screenshot)