How do I get from Nanjing from the Jin Jiangning inn to the Confucian temple, please?

Do you mean the Jinjang Inn (Nanjing Jiangning Baijiahu 1912)?
If so, from the hotel, you can walk about 550 yards to Baijiahu Subway station, where you can take the subway line 1 to Sanshan Street. Take the Exit 4 and walk about 650 yards, you will reach the Confucius Temple.