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If you want to access NX models in Teamcenter, you will need the Teamcenter 4-tier or 2-tier rich client installed on your machine. This is a requirement for Siemens NX CAD tool.
If you have a 4-tier rich client installed on your machine, follow the instructions - Accessing NX models in Teamcenter using 4-tier Teamcenter rich client
Alternatively, if you have a 2-tier rich client installed on your machine, follow the instructions - Accessing NX models in Teamcenter using 2-tier Teamcenter rich client