Hi Anurag,
Upon looking at your screenshots I can see a couple of issues:
1. Under authentication -> Select Basic (ensure the Id/Password are correct)
2. The syntax for Id should be -> CN:IDM_TEST_557,ou=nwidm1,o=ids
Before sending the Add requests I suggest you send a search request to see if you get a response back.
Are you using the SPML staging area? or are you writing to the Identity store directly?
Let me know how you go.
Cheers
KV