I'm learning how to

i got a small amount in my wallet adress where i received it from bitvavo ( 0.00002738 )

now i try it to send to another adress in the same wallet but it won't work

i'm unable to press the ''send'' button

how do i send bitcoins for payments... i have to do large payments and i'm scared i get stuck '..so i thought using a small amount to practice would be a good idea