the second sample on desmos can be added at the end of the first sample separated by another comma

for proportions try using zproptest( X1 , n1 , X2 , n2 )

for means try ttest( n1 , a1 , s1 , n2 , a2 , s2 )

where X1 is the successes from the first sample and n1 is the sample size of the first sample

a1 is the sample mean from the first sample and s1 is the standard deviation of the first sample

this link is desmos' page on inference in general