Change logo and name wiki to another name

thanks for gitea
i need change logo gitea to another logo ( in localhost for test ) and change wiki to another name
but i don’t know how to can i do it that
please help me

Here is documentation on updating things such as the logo:

As for changing the wiki name, do you mean changing the name of the tab on a repo? If so you can update the translations (also documented in the same link above)