For a self employed 401k plan for an over 50 year old how can increase the maximum allowed in turbo tax?

[hp2018]

Turbo tax keeps limiting the maximum allowed for Qualified plans based on an SEP ira contribution.  But solo 401k for self employed or Keogh are treated differently and maximums are much higher.  But I can't seem to get Turbo tax to figure that out, so it keep saying I have an over payment and limiting my deduction.