In general, it helps to mention things like:
2) What is the length of the video and what type of images (file type, largest file size...) you are using.)
3) More specifically what happens and what does not happen when you try render to youtube (popups, errors, any indications of progress...)
Most of the good troubleshooting threads suggest that you:
4) Save the work file online and tell support the name of it if you want them to look at it.
5) Export a .scribe file and attach it here for help from other users.
Aisling, looking at your scribe for you now but with a quick look I can see a number of your elements have a zoom level of around 1000% and this causes a lot of RAM usage and cause a render to failure. This is covered under point 5 on Mike's tips to avoid crashes link. If I can render it successfully I'll put a YouTube link in the ticket for you if not you will have to revist your scribe, make some of the images larger and then decrease the zoom %. Happy to give you a couple of days extra trial to get that done if it comes down to it.
Ah ok. Glad it worked for you. Worked for me first time and sent you the link on the ticket