The summary isn't really English, I can't work out what you are trying to say.
My best guess is that you have a list of issues where a certain person is the current assignee, and the issue type is "task". You want to set the priority for all of them to a certain setting.
The answer to that is "use bulk edit". But I'm not sure my guess is correct - could you confirm? And if it's the wrong guess, explain a bit more?
if you ant to order the issues then one way is to add a numer-customfield and name it like "order". There you can enter a numer for priorization and sort this column in the navigator. The other way is you use plugins which will allow you to order by drag and drop.
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