To block the Bytespider bot on WordPress, you can use the robots.txt file. Here's an example of how you can block access for the Bytespider bot:

1. Log in to the admin panel of your WordPress site.
2. Go to the "Appearance" tab and select "Editor" from the dropdown menu.
3. Find and select the robots.txt file for editing.
4. Add the following lines to the robots.txt file to block access for the Bytespider bot:

```
User-agent: Bytespider
Disallow: /
```

5. Save the changes.

These instructions should help you block the Bytespider bot on your WordPress site. Remember, robots txt is a standard way to control search engine bots' indexing on your site.