MyBB Community Forums

Hi,
I am trying to convert Burning Board 4 to myBB. It is a localhost conversion for test. After entering database location I get an error:

Error
There seems to be one or more errors with the database configuration information that you supplied:

The WBB 4 database could not be found in 'xxxxx'. Please ensure WBB 4 exists at this database and with this table prefix.
Once the above are corrected, continue with the conversion.

The WBB 4 database indeed uses table prefix. But I do not see any field where I can enter the prefix. This is how my conversion form looks like:
[attachment=42351]

Where am I expected to enter table prefix?
Thank you in advance.

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It seems like additionally I use false converter. I have read this thread https://community.mybb.com/thread-224683.html My board is on WoltLab. Forums 5.x and there is no converter for it. Right?