How do I add to my profile I can care for more than one dog at a time?

Go to your Profile:

https://www.rover.com/provider-profile/

and under each Service Setting listed on that page, you will see a heading for Pet Preferences, which asks how many pets you can accommodate. You will have to do that for each service you offer since I see that you offer pretty much all of them,

I took a look at your Additional Rate table and see a couple of problems. You shouldn't enter a rate for 4 nights or more since it is the same as your regular one. The problem might occur during a holiday period, when the customer would be billed that lower rate instead of the holiday one. Also, since your Additional Dog rate is the same as for a single dog, you shouldn't fill it in. Both dogs would be charged your regular rate in effect for whatever period. Your puppy rate under House Sitting is less than for an adult dog, when it should be more