If you find bugs or something not comfortable for you, please contact the developers described in following references,

Yamada, T.G.; Ii, K.; Koenig, M.; Feierabend, M.; Draeger, A.; Funahashi, A. SBMLWebApp: Web-based Simulation, Steady-State Analysis, and Parameter Estimation of Systems Biology Models. Preprints 2021, 2021080259 ( doi: 10.20944/preprints202108.0259.v1).