If the script is in .zip or .rar format, just extract it to <soldat server dir>/scripts, if it isn't then paste the .pas file into a folder in scripts, i.e. <soldat server dir>/scripts/Script1/Script1.pas
You will also need the includes.txt file, if it didn't come with one, make a new text file with the scripts name, in the example I used, the includes.txt file would contain Script1.pas
[EDIT] Grr blackdevil. At least my explanation is better than yours
.