From the Admin Interface menu (Tables -> Bid Increments) users can add new or delete default increments. The increments table is preset to accept specific (fixed) increments for prices that fall within an established range. See example below:
In the Front End complete all the steps described in the Create page.
In the Listing Settings section, select one of the Bid Increment options:
1. Use the built-in proportional increments table (see picture above)
2. Enter a custom increment amount:
When selecting the second option, users will be asked to provide a specific increment amount.