Hello, @DeryaDalkilicBulut
If your DocuSign account is a corporate account, so someone from your company is the Administrator and created your user, but it seems your user is a Viewer that cannot send envelopes.
In general, companies have Admin users from the IT or Legal departments. Contact them asking for who is the DocuSign eSignature Administrator so he/she can change your permission profile to a Sender user.
I hope that helps!
Alexandre
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