How to I change the setting on my LG phone so that the text messages automatically delete?

I got the new LG GM310f 3 days ago. Today the inbox was full at 257 and outbox was full at 253. Then I get a thought saying please delete ancient messages because I can’t recieve new messages untill I do. I went to setting looking for how to set it so the buzz automatically deletes ancient messages but I can’t work out how to.

Can somebody please tell me how to change the settings or is it not possible to change them?

Thanks, Missy

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