need help with numberp and memberp

im not sure if im using the right ones or not but this is confusing me
and i need this soon


numberp :v iffalse [messagebox [error] [you need to use number(s) are
your first digits]]
numberp 1>:v>13 iftrue [messagebox [error] [your first 2 inputs must
be numbers between 1 and 13]]

these are my codes
first 1 varify that the digit you put in is a number the second is to
make sure its b/t 1 and 13 (using to make a poker program)

get this response
"You don't say what to do with true in test.value
[numberp :v iffalse [messagebox [error] [you need to use number(s) are
your first digits]]]
"
i dont know what can be more clear but this is messing me up im going
to continue working on it for a while hope i get a response soon