Hi Dimitri !
You can do both of these configurations if you are admin of your instance.
You need to check the Resolution tab in Cog > Issues > Resolution.
For your second question, you can find everything you need here :
It will allow you to create a Field configuration and to make Resolution mandatory.
You're sill looking at the resolution field here.
To change the options availble, you need to go to Admin -> Issues -> Resolutions and edit the list in there.
Note that you should NOT make resolution mandatory. If you try to make it mandatory, you will have to set a resolution as you create an issue, which means that you have resolved it. You will never have an open issue.
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