Purchase agreement contract question! help!

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Hello, I am fairly new to real estate investing and I have obtained a contract which I plan on using for wholesaling real estate , I understand most of the Purchase and agreement contract except the line where it says " Subject to existing financing": I don't know what to put there! also where it says "Equity" I mean how I am suppose to know the exact amount of equity there is, doesn't that change depending on who is Calculating the Retail value of the home? Heeelp,

so to sum it up, I need to know what to put on "subject to existing financing" and "Equity" lines on my Purchase agreement contract for wholesaling real estate!.