Hi @kaizen s,
If you are using Google AdWords Express then this tool is not available for this platform as AdWords Express works on the phrases related to your business. You can not add keywords by your own.
Based on the type of business you have, system comes up with a list of search phrases that will trigger your ad and potential related sites where your ad can appear. The system continues to maintain and update your search phrases over time.
If you want more control and optimization features including the Keyword Planner tool then you can go with Google AdWords.
Here is the comparison file between these two platforms.
Archit, AdWords Rising Star, Community Profile
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