What is ServiceNow personal developer’s instance?
The ServiceNow Developer Program provides developers with resources to learn, build and deploy applications on the ServiceNow platform.
Once registered for the ServiceNow Developer Program, a personal developer instance can be requested on this site either from the Developer Dashboard or from the Manage main menu.
ServiceNow offers free, full-featured personal developer instances (PDI) to registered users who want to develop applications on the ServiceNow platform or improve their skills with ServiceNow. Members of the ServiceNow Developer Program can use their PDI as long as there is activity on the instance.
If there is no activity within 10 days, the instance will be returned to the pool of available instances. If this happens to you, request a new instance and a new developer instance will be granted to you if available. For more info Servicenow Training
Step 1. Go to the ServiceNow website, click sign up

1.1 Complete the following information

1.2 On completion a confirmation message will be presented (similar to as shown below)

Step 2. You should get an email as shown below (check your inbox / Spam folder) – click on Verify Email

1.5 After your email is verified your account will be activated on ServiceNow site

Step 3. Please use activated email address and password to sign in to the
ServiceNow developer site

Step 4. Log in to the ServiceNow developer site
4.1 Open the Manage menu and click the Instance menu item

4.2 Click the Request Instance button
(if prompted fill in the how you will use your ServiceNow)

4.3 The below option will be presented to choose a version if you are not clear choose ‘Madrid’ as suggested.

Step 5. Congratulations, you successfully created a ServiceNow instance
When the instance is assigned, the screen updates to display the instance URL and the admin credentials. If you navigate away from the Manage Instance page (similar to below screenshot), you will receive your instance name and admin password by email. Copy the admin password to the clipboard.

5.1 Click the instance link to open the instance in a new browser tab
Log in to the instance:
User: admin
Password: <password you copied to the clipboard>
After logging in for the first time, you are prompted to change the admin password. Passwords must be at least 8 characters long and contain a digit, an uppercase letter, and a lowercase letter.

Step 6. You are all set your developer instance is created

To get in-depth knowledge, enroll for a live free demo on Servicenow Online Training