iampwr

[gusty mauve]

Please be patient

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[alpine pier]

Can anyone help me with this

[narrow lynx]

With what?

Are you asking about which auxiliary to use, what tense, or both?

On that first question, look at the verb. If it has a direct object, you use « avoir »; if not, use « être ».
« Je suis retourné de la guerre (I came back from the war) »
–> « de la guerre » is not an object of the verb « retourner », it is a complement adding info from which state I have returned. I can safely eliminate that and it'll still be grammatically correct.
« J'ai retourné la poubelle (I turned over the rubbish bin) »
–> « la poubelle » is an object of « retourner », describing what it is that had been turnt over. I can't eliminate that without it losing meaning; what did I turn over?