more than one id on my phone

That means the iPhone was not correctly wiped and restored for you to use it and it still has apps tied to the previous owner's apple id.

Best to wipe it and start over to avoid any further issues.

Otherwise, you'll need to delete the Apps that are tied to that Apple ID, and download them with yours instead.

But this does not guarantee that other issues tied to the previous owner's Apple ID will not crop up later.

If you don't want to wipe it, at least make sure the previous owner's Apple ID is not logged in to anything else such as iCloud, Facetime and Messages.

What to do before selling or giving away your iPhone, iPad, or iPod touch [or if you received one that had not been erased] - "Use these steps to remove your personal information from a device, even if you don't have it anymore." - https://support.apple.com/HT201351

Did you buy it brand new from Apple? Typically this happens if you buy a used iPhone that has not been wiped for another user. There are apps that are registered to the other person's ID and you cannot update those with your ID. You have to delete the apps and download them with your ID.

The nasty surprise that may be waiting for you is if the previous owner has not disabled Activation Lock and you do not know who that person was. Now you have a paperweight-in-waiting.

Find My iPhone Activation Lock - This is a security feature, in part to deter re-selling of stolen devices.

http://support.apple.com/HT201365

Turn off Find My iPhone Activation Lock (formerly: Activation Lock: Removing a device from a previous owner’s account) - An activation lock can only be removed using the log-in information for the account that applied the lock.

https://support.apple.com/HT201441

Get the owner of the account to remove the lock or return the device for a refund. The device is otherwise useless to you.

If the owner has not provided contact information as a message showing in the login screen, there is no way to contact the owner unless the person who gave you the device knows them.