Parinaz Salehi Kahrizsangi Your question is not clear about the problem. Anyhow, you may watch the videos below link

https://www.youtube.com/watch?v=eriWiHMte_o&list=PLKA2hkKbaj3dW8NmkNZF71a44NTbQrXhP

And also some tips as follows,

1. make sure that your software is official

2. Try to connect the PSTrace to correct instrument model (it will show the instrument model name)

3. Select the technique (potentiometry/chrono amperometry)

4. If you select chronopotentiometry, select the maximum current range/ depends upon your system that generate current.

5. Give a working potential at Edc

6. Time for data will be normally 0.5 s and start the experiment

I think it will be useful

good luck

Dear Dr. Balamurugan Thangavel

Thank you for your help.