Select the range you want to process A6:L1130, then in name box here, type the name (if the name doesn't already exist you'll see the cell address A6, which you overwrite):

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Changing its extent is a bit different if it already exists. You can go into Name Manager on the Formulas tab of the ribbon:

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and either delete it in the dialogue box, then go back into the sheet and recreate it as before,
or
you can edit it directly in the dialogue box:

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