You can import or export via your shell account or from your PC.

EXP Example
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exp UserName/Password@ConnectionString  file=MyExport.dmp  log=MyLog.txt


IMP Example

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imp UserName/Password@ConnectionString  file=MyImport.dmp  log=MyImportLog.txt fromuser=UserName touser=UserName

The required connection string is provided to you in your welcome email.

If you have any questions, please raise a support ticket.