customize→ edit html→ highlight and delete previous theme (Ctrl+A→ Backspace)→ copy (Ctrl+C) and paste (Ctrl V) new code→ update preview→ save!
Edit my theme/Custom theme?
If it was a theme I created myself, I will help you edit! If it is a theme I have not created I can help you to a certain extent, just ask! I will not make you a custom theme, sorry. However, you can leave a theme suggestion.
Can I remove the credit?
You may remove the header link credit. No other credit shall be removed or I will report you. Ask if you have any questions about this.
My ask is not working?
You probably have your ask disabled. To enable questions: settings→ click on your blog (on the left)→ check the 'allow people to ask questions' box→ save!
Description/Title won't change?
There is most likely a glitch with the meta tags! Use Ctrl+F to find the text you want to remove and then replace it with what you want! Don't forget to save!