Two ways. On the app, down near the bottom, are 'upgrades'. If you don't have EAP, it's $199/month. If you have EAP, it's $99/month.How do you rent FSD?
Otherwise, on the car, on the Upgrades tab, there's a similar offer.
These days, all the versions delivered to people have FSD built in, typically 11.4.9 at the moment. So it's not like it was last year, where, after doing the rental/buy/whatever, you had to wait for an FSD version embedded in a standard load whose version number (yyyy.ww.random.numbers) was higher than the one you had on the car. So, once you've paid for it with ye credit card, it should be available pretty much immediately.
Finally: If you have a base Tesla with none of this EAP/FSD stuff, under the Autopilot tab, there's a button near the top that enables/disables autopilot's lane keeping/TACC, both of which you have to answer Scary Accept This buttons before you can use either, with warnings. Fair enough.
When you add EAP, you get two, count'em, two of those buttons, along with scary warnings for each. The EAP one is to the right of the Standard one. If the EAP is off, it's like you didn't pay for it and it doesn't work. If it's on, you get the fun auto lane change (if the option is enabled), plus whatever else EAP does for one.
When you add FSD, you get three buttons up there, the right-most one with the FSD capabilities.
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