how to reset?

Depends on how far back you want to go back. If you just want to revert any and all changes you’ve made to WP.

Then go to https://www.www.ads-software.com/download and grab the latest version of WP, delete all files on your website except wp-config.php, upload all the files and run /wp-admin/upgrade.php

If you want to start your blog all over again with no posts at all, then go into any database management program like phpMyAdmin that you might have running on your website, delete your current database, re-create it and do the same steps as above, but run /wp-admin/install.php instead.

Vague questions usually illicit vague responses. Please tell us in a little more detail what you want to accomplish such that you don’t lose things you didn’t want to lose.

Regards

Thank you. Let me describe my trouble: I’m a newbie of weblog. I have download and instal a lot of thing into my site and I find out what I like at last. I just don’t know how to remove all thing I have uploaded and I think the best solution is refresh my site (I know nothing of coding). I have a bakup of that site on computer’s hard drive. It doesn’t have to much and I intended to re-post all whenever I reinstal my site.

Am I right?

and… how to run upgrade.php or install.php. Will it change any setting of my site such as usename, password, etc. What will I get when I run that?

Thanks a lot.

I think you should basically follow the steps required to upgrade WordPress. If you delete all of your old wordpress files except wp-config.php, you will have a fresh version of wordpress with the default theme, but you will save your database, which includes the posts you’ve made to your blog.

Brainwidth speaks the truth. “Upgrading” your current installation with a stock version of WP will leave your username/password/posts/configuration intact and will only return WP to it’s default state.

Then you can take the step of bringing back whatever you liked when you were playing around.

Additionally, for the future, you might want to consider creating a second test installation on a subdomain (if your webhost supports that) or subdirectory for you to play around on and if things go badly, you can wipe it away with no qualms.

Regards