updating rss2 feed code

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dear all
a programmer is making an android app for my wordpress site
for that he told me i should update the RSS2 feed so it will allow me
to call the images when the app loads

i honestly have no idea how to do it
so if there is anyone who can help me urgently

please note:
1. am using "me gusta" theme, in the option i chose to use the deature image in the post directly (instead of posting the image in the post so it will have a better viewing option)

i wpuld be thankful of someone could help me on this one

P.S : i asked the megusta theme auther this question but until now he didnt reply (could be busy)

if you need an extra information please ask me

reagrds