Every time I to to weibo on my PC, it asks me to scan the QR code using the weibo app on my phone. I do this, and the QR code has a green tick. The box on the app says "log on to the web version on your computer", but I can't seem to  do this. Where do I click/press after the qr code gets the green tick? I prefer accessing weibo on my PC as the images look much better on my 32-inch 4K monitor than on my phone :)

After scanning the qr code and getting the green tick, press the green button in the lower part of the app (it should say something like "confirm access"). The webpage will automatically refresh after a few seconds and in the top bar you should be able to see your username. Sometimes you might need to refresh the page manually...