After you choose IntelliSense | Parameter Info in the left pane of the ReSharper Options dialog, it looks as follows:

- Select the checkbox if you want the Parameter Info popup to be displayed automatically;
- Specify the delay in milliseconds for displaying Parameter Info in the autopopup mode;
- Select whether you want to display one signature at a time or all of them;
- Select whether you want to the Parameter Info popup to have focus (so you can use the arrowkeys to select signatures), or not (then you can press Ctrl + P and Shift + Ctrl + P to select signatures);
- Don't forget to click OK to save your changes.
See Also
ReSharper Options | Visual Studio Settings