Yeah you may need to ask your host what you put in there, im not sure if they want to whole string or just part of it.
But i guess yours dont work that way. What is in the drop down for hours, what does that drop down look like.
what happens if you enter that url in a different browser, dont use the same browser you tried to register on.. the cron url put that on a dif browser and try it
the reason it is showing you that page is because you have a cookie on your computer from the software that is set because you just registered.
So if you have ccleaner then close down your browsers and run ccleaner, if you dont have that you can get it for free here https://www.piriform.com/ccleaner/download
or we can try to this the old fashioned way.. which ever you want.
see run this on a different browser
http://unitedjuggalospace.rf.gd/ow_cron/run.php
you will get the white page of the cron, thats what it does it just has a white page as an output, its normal. so that is right