Sometimes, you may want to break the long submission page (let's assume "submit article" for example) into multiple steps. As of version 6.2.6, you can make custom templates for each additional step.
Go to the template editor at Admin Panel -> Themes -> Manage Templates. In the regular submit article template, find the submit button HTML -- in a multilingual install it'll be
After saving that, find the create a custom template area toward the bottom of the template editor page. There, create a custom template named yourstep2template (or whatever name you put in step 2 button value). Copy the contents of the submit article template into there and remove all parts you don't want to be on the step 2 page (and remove everything from the submit article template that you don't want to have on the step 1 page).
You can create a step 3 simply by using
<button type="submit" name="preview" value="submitstep2" class="previewbutton">Preview</button>
To present a button which when pushed will take the user to a previous step, use
Replace suggestlink with the appropriate step's template if it's not going back to the first step.
Warning: The CAPTCHA/challenge, WYSIWYG description and any file uploads have to be on the final step of the submission in order to work.