it tells you what the minimum/maximum number is as the case may be.
That is specific to your Template.
ok...
1. Login
2. RE-Login to ACP
3. click "Users and Groups" tab
4. Click "Custom profiles fields" link on Left hand side
5. In the textbox type "ruhuman"
6. Double check that the drop down box is labeled "Numbers"
7. Click "Create New Field" Button
8. Modify the settings:
- Publicly display profile field: NO
- Display in user control panel: Unchecked
- Display on registration screen: CHECKED
- Required field:CHECKED
- Hide profile field: Unchecked
9. in 'Field name/title presented to the user:' enter:"If you are a real person then, what is 3 + 4 ="
10. In "Field description:" enter: "This is just a check to make sure you are not a spammer. Even Gully Dwarfs need to know some basic math!"
11. click "Save" button
12. repeat step 4. Click "Custom profiles fields" link on Left hand side.
13. Click on the Edit 'cog' next to the field labeled 'ruhuman' To edit the field.
14. Click on the button on the bottom of the page: "Profile type specific options"
15. Modify the settings:
- Length of input box: 7
- Lowest allowed number: 7
- Highest allowed number: 7
- Default value: 1
16. Click "Save"
17. Laugh at anyone who thinks 3+4=1, Including spammers and bots.