Welcome, I am Cory. Thank you for asking your question today.
Do you know what model Kindle it is?
I am following up with you to find out if you still need assistance with this?
By the time you change the charging port, it will cost as much as getting a replacement. It sounds like you may have a Kindle Keyboard. You can buy one on eBay for about $25 including shipping.
You can find it here. - http://www.ebay.com/itm/172387591005 or search Kindle Keyboard on Ebay.
When you register another Kindle, you will not lose the books you have already purchased as they are stored with Amazon.
Please let me know if you have further questions. Please do not forget to rate my answer above with the stars.
I am following up to find out if you need further help with this.