It would be easier to help if you could be more spesific about what it is that you can not get to work. The key to linking missions is the name of the mission you want the game to load when the player finishes a mission. The name of the mission is what you have set as the "Title" in the LevelDoc settings for the mission. To access the LevelDoc settings you open the
Settings menu and chose
Level. In the properties area on the right you see "Title". What you enter here is what ends up as the name of the mission in the mission list when you play the game.
When you want to link missions, you use the "Set Next Mission" trigger action. You can include this action in the trigger that has the "End Mission: Win" action. I think you should make sure that it is listed before the "End Mission" action, as the actions are executed in the listed order. The name of the mission for the "Set Next Mission" trigger action is the first 22 characters of the mission to be linked to, followed by ".lvl". If you have set the title of the mission you want to load as the next mission to "Storm", the mission name would be "Storm.lvl". Make sure there are no spelling errors in the mission name.
Hope this helps.
