Unfortunately, wireless keyboards cannot be used with the Blu-ray Player. However, you can connect 101 keys USB keyboard to the jack on the Player and can use for for manual text input while browsing.
If you are not interested in using wired keyboard, there is an application called "Media Remote" which you can use from your Android Smart phone or iPhone, iPad etc. It has the keyboard feature to enter letters, number or other characters on the TV screen.
Detailed information about Media Remote application is mentioned on the below pages: