OK, so now I realise that there are some things that you can do on the PC that you can't do on the android tablet blogger app, and one of them is that you can switch between "compose" and "HTML" views as you compose your blog entry. Whilst on the PC I took the time to correct the timezone also. Now I notice in the top right of the android compose window three icons, one of which depicts a chain (for a link) so I will go ahead and try to drop a YouTube link below:
Ok, so that seems to work, but doesn't quite give the flexibility of switching to html. I have set my blog to be moderated for now until I get the hang of this!