What url are you looking for? "fits the plug-in" doesn't tell us a lot.
I try to install Joggler as described in the install description of joggler:
Note: You must have administrative rights to install an add-on.
and JIRA asks for an URL to upload. My questien is: What file? (JIRA ask for an URL)
Upload your Atlassian Connect add-on descriptor from the Atlassian Marketplace.
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It looks like you are using Cloud JIRA? Where you can't install this type of add-on, so there is no "upload add-on" option.
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