Lightroom provides two choices for uploading your photos and videos:
1. Use Lightroom’s Export capabilities. I find this the simplest approach. Follow these instructions “Uploading photos – Export“.
2. Use Lightroom’s Publish capabilities. Take a look at the “Uploading photos – Publish” guide if you want to use Published Services.
If you want to understand the difference between Export and Publish then here is a quote from a good article:
“What’s the difference between exporting and publishing? A good question. Well, exporting is a one-time, one-way event. Not so with Publish which will ask if you want a re-edited image updated and, in some cases, will even pull back information such as comments into Lightroom.” – www.diyphotography.net
The following guides cover more advanced use of the plug-in: