Can I, or should I add a lead form extension to an existing search ad that is running already

I just started a brand new campaign (maximize clicks bidding) option a few days ago at $35.00/daily. I realized that it would be really fitting to add a lead extension to one of my ads, but I am wondering how I should go about it without throwing anything off. Right now my main conversion goal is purchases in terms of campaign setup. What is the best protocol?

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