I hope I understand your question.
You cannot export your codes in sololearn.
If you want to save your code on your disk.
Copy the text.
I you want to save the code written in the playground.
Click the "Save As" or "Save" button
(If you save the code first time, choose "Save As")
Give the code a name, and you can find the code in the "my codes" section
Does this answer your question ?