You should be able to pull the ignitor's wires through the opening in the rear panel far enough to get to the plug. If not, then remove the cover from the rear of the oven and get to the plug from the back.
Find Appliance Parts at AppliancePartsPros.com - Largest inventory in the U.S. with 91% of all in-stock orders delivered within 2 business days. Thousands of photos and diagrams make it very easy to find the right part. Enter your appliance model here.