Hello
When you press the [substitute] button, on a list, that one modifies the original list on the same line, the replacement must be done on a new line.
current
1: list1:={y=x^2,y=2x+3} (input) returns
list1:={y=x^2,y=2x+3} (output)
then
[substitute]
x=3
y=1
returns
1: list1:={y=?,y=?}
substitute x=3, y=1: list1:={9 = 9, 9 = 9}
correct
1: list1:={y=x^2,y=2x+3} (input) returns
list1:={y=x^(2),y=2x+3} (output)
then
[substitute]
x=3
y=1
returns
2: list1 (input)
substitute x=3, y=1: {9 = 9, 9 = 9} (output)
Also as a suggestion, to show a more explicit output, put the argument firts
1: list1:={y=x^2,y=2x+3} (input) returns
list1:={y=x^(2),y=2x+3} (output)
then
[substitute]
x=3
y=1
returns
substitute list1, x=3, y=1 (input)
{9 = 9, 9 = 9} (output)
The same problem 
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