Unfortunately that's not an option for those of us on mobile :( We get one choice only and it's as you see above. I would say "well wait until you can post from a proper computer" but I know that's not always an option. I only have one choice when posting from slimgur as I'm disabled I can't use anything other my touchscreen phone or tablet to post. It would be really helpful if the urls for all options were available regardless of where you're posting from (the way imgur did it).  Mobile users could then choose the full image link to copy instead of just the standard url provided. Slimgur hasn't caught up yet so many people are limited to these kinds of links.