Correcting errors with the help of W3C
 

When analyzing my blog at w3c I noticed a lot of errors. Searching the NET learned how to fix them. However, I do not know how to make the corrections.
Do I need to copy all the html in a txt file, make the corrections and paste the W3C again and re validate?

I've done it and it did not work. By entering my url again, showed me the same errors.

Could someone help me to validate my site?