If you are voting on November 3rd, 2020 (or earlier), you have pre-printed choices for your consideration. However, if you plan to write in a candidate, be aware that you can't write in just any old name. In Dallas County Texas, at least, if you're going to write in a candidate, it must be a name from the "List of Declared Write-In Candidates."
There are 9 write in choices for President and one for U.S. Senator.
For Presiden/Vice President:
President R. Boddie/Eric C. Stoneham
Brian Carroll.Amar Patel
Todd Cella/Tim Cella
Jesse Cuellar/Jimmy Monreal
Tom Hoefling/Andy Prior
Gloria La Riva/Leonard Peltier
Abram Loeb/Jennifer Jairala
Robert Morrow/Anne Beckett
Kasey Wells/Rachel Wells
You can vote for a declared write-in candidate by writing in the name of the candidate on the line provided and darkening in the oval provided to the left of the line.
Whether you choose one of the well-known candidates or write in a name from the "declared list" ... VOTE!