In the "stream file" section, type in the name of the gds file
In the "Library" section, type in the new name of a library. This library name will be created by the translator.
For example, enter "mydesign". This field is a drop-down list but you can also enter text directly.
In the "attach Technology Library" field, click on the drop-down box and select the library that you created earlier (you said that this was successful).
If everything is set up correctly, after translation you will see a library called "mydesign".
"Mydesign" will contain the results of the translation The library will be attched to the technology library that you created earlier.
There should also be default layer colors defined so that when you open the layout viewsyou see colorful layout. If everything is yellow something has gone wrong.
Hope this helps