Wordpress/ PHP theme edit

I'm very new to making websites and programming and i was wondering if someone could point me in the right direction.

I have created a wordpress website using a theme called AdForest.

In the website you can create a listing and the theme makes the user upload a picture which i want to remove - see this link to see what i mean https://i.stack.imgur.com/wvLGo.png

There is no option in the settings (that i can find) to remove this option so i wanted to try deleting the source code for it.

I cant find where this is in any of the code files.

Please can someone let me know which of the below files this code will be in so i can delete the code?

Theme Files
style.css
functions.php
adforest-childfolder
assetsfolder
cssfolder
editor.css
skinsfolder
jsfolder
404.php
archive.php
author.php
comments.php
fontsfolder
footer.php
header.php
imagesfolder
incfolder
index.php
languagesfolder
ICONS Page Template
(page-component.php)
Elements Page Template
(page-element.php)
Home Page Template
(page-home.php)
Notification Page Template
(page-notification.php)
Ad Search Page Template
(page-search.php)
All Seller/Buyer Page Template
(page-users.php)
page.php
required-pluginsfolder
search.php
sidebar-ads.php
sidebar.php
single-ad_post.php
single-project.php
single.php
taxonomy-ad_cats.php
taxonomy-ad_country.php
taxonomy-ad_tags.php
template-partsfolder
tgmfolder
uploadsfolder
vc_imagesfolder
vc_templatesfolder
videofolder
woocommercefolder
readme.txt
wpml-config.xml`