Doh, i just found the solution to question 2. I must RTFM! According to the author:
“Go to the gallery management and choose your gallery. There is a field named “page_idâ€?. Fill in the id of your static page which you wrote down earlier, save the changes and return to the static page. Edit the text of the page and type [mygal=(NAME OF THE GALLERY)].Save the page.
Now you can see a gallery with thumbnails in your blog.”
Don´t forget to change (NAME OF THE GALLERY) with the actual name of your gallery.
I´m still stuck with problem 1, thought.
I don’t understand php very much, is this a problem i can fix by myself just putting the files in some folders on my wordpress directory or must i contact the provider to install it?