How to set up a cron task in Plesk every 15 minutes? - cron

I'm a total newbie with Plesk, and I'm wondering how to set up a cron task for executing http address, which is updating profiles. I have my link of course, and I want to run this link every 15 minutes, 24 hours a day, non-stop.
I'd be very glad if you guys could help me with that.
Here's my cron task configuration for root:
What should I fill in minute, hour, day? And how about command?
Thanks for helping me,
Mike

It's not quite clear what do you mean under "executing http address"
But you can try this setting
Since Plesk 12.5 there are task options:
In Plesk 12 and below:

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