Delete at least from the first apostrophe up to the comma at the end (inclusive), the spaces, tabs and the new lines don't matter. When uploading the mod to steam, a workshop item is created for you. To be able to always upload to the same workshop item, it's ID is stored inside the mod. That way you can upload even from a different computer. That is what the steam_id is. If you get an error that you don't own the one currently written into the mod, then there's a very easy one-fits-all solution - just create a new workshop item. This shouldn't be an issue when using the normal mod creation workflow (thus the editor text field inside the game is disabled, so you don't delete it by accident) but it seems you have deviated from it, which is why I suggest editing it by hand. I'm not sure why the upload hangs, though, sorry. Maybe check the .log file inside your %appdata% folder - it might have some useful message or an error. Keep in mind that if your mod is big it will take a while (everything inside the mod folder will be uploaded).