To set those, you will need to use the Communications module within ClarisWorks to issue AT commands, which are described on pages 47 and 48 of the TelePort User's Guide. Below is a summary of these commands:
%C0 Disables data compression.
%C1 Enables MNP 5 data compression
%C2 Enables V.42 bis data compression.
%C3 Enables both V.42bis and MNP 5 data compression (factory default)
\\N0 Selects normal speed buffered mode; no error correction.
\\N1 Selects direct mode and is equivalentto &M0 and &Q0.
\\N2 The modem will first attempt a LAP-M connekion and then an MNP
connection.
\\N3 Same as \\N2, except failure falls back \\N0. Factory default.
\\N4 Tries to establish LAP-M correction; if failure, modem hangs up.
\\N5 MNP mode. Failure to make an MNP connection results in the modem
hanging up.