Problems with Child theme

Hello,
I have purchased the auctionpress yesterday. I got to know the advantage of child theme so I decided to install it last night. However there are major problems that were occurred.

I tried to upload the theme through appearance (adding theme tab) but it showed an error with [XXX] yet successfully installed. I changed directory to ‘auctionpress’ which is my core folder name. However, still did not work. So I tried to upload files through filezilla at public_html/wp-content/themes/auctionpress/themes and saved a folder name as ‘auctionpress-jong’ I could bring a screenshot to admin area. However, after I saved the change, the website looks cracked.

Some people are claiming that it automatically changes when you add the child theme but it does not change. Please help me 🙁 I am struggling with this problem more than 12 hours.