Do I have to connect my dac to my computer?

No. Transport -> DAC-> Pre/Amp

if you want to stream tidal from your computer then Yes. Computer must be connected to DAC. So in the above chain just replace transport with computer. 
You can have them both connected to most DACs

The Lampizator site has a “Superkomputer” listed.  Is that your transport?  It looks like it is supposed to be used with Roon software.  Perhaps you need to download that to stream Tidal.
Roon offers free trials.

No I have the Older transport