Start and End Dates can be added to a process via the Edit Process Summary dropdown, on the Update Process page. This only affects an applicant's ability to start an application and is NOT a deadline to submit a form.
If you have entered a Start Date for a process, applicants will be able to start a new request in the process beginning at 12:00 AM on the start date (in the time zone selected in your site settings). The process must also be toggled on in order for applicants to apply.
If you have entered an End Date for a process, applicants will no longer be able to start a new request in this process after 11:59 PM on the end date (in the time zone selected in your site settings). The Apply button will disappear, and if an applicant has not started a request by that time, they will not be able to do so.
Process Order on the Apply Page
Public processes will appear on the Apply page according to the order on the Available Processes list on the Process Manager page (not according to Start or End Dates). Use the six dots to the left of the process name to drag them up or down the list. Please note, Universe processes in SLM will always appear at the top of the Apply page.