Form Builder: How do I leave a space alongside dropdown option?

I want to leave a blank next to "Other" and "Referral" for prospects to type in value, i.e. referral name. 

That is possible by adding a Single Choice field to your form and adding Other option to it. Please see below.

You can check my test form: https://form.jotformpro.com/72415313579963.

That solves the "other" issue, but I want to do the same thing for referral name.  Is that an option? 

Thanks! 

You can add a field to your form that will be conditionally hidden/shown based on the answer to your options (i.e. Show the field if Referral is selected. Otherwise, hide it.). See steps below.

Please check my form: https://form.jotformpro.com/72415313579963

Please also check our guide on Smart Forms Using Conditional Logic

Perfect! Thank you!