The Elections tab on the portal allows you to collect both nominations and votes. This article will show portal nomination process with reference to the set up details in CRM.
Set Deadlines, Requirements, Forms, and Restrictions
See the election record article for full details about each field, but the fields you will need and the optional requirement subgrid are in the screenshot below.
On the portal click the Elections tab to see the election information

Note that the Nominate button shows up if the current date falls within the begin and end dates for the Nomination window set on the election record. Otherwise no nominate button is shown, or the voting button can appear.
Click Nominate
Click Add Nominee or Edit/Withdraw Nominees
The display will show Add Nominee if you do not have any current nominees, and/or if you are allowed to add additional nominees.
The display will show the edit window if you currently have nominees and will be the only item to display if you have reached your allowed limit of nomination records.
Add Nominees
Use the search boxes to find existing contacts. If a match is found then results will display along with the option to "Add Myself" if applicable.
If no matches are found and write-ins are allowed you will be given the option to create the new contact for your nomination.
