Need Help uploading code

Hello,
I've worked on math 7.0, but don't understand Gerrit.
Can someone explain to me where to upload the code, please?
Implemented: *Bug 47914*
<https://bugs.documentfoundation.org/show_bug.cgi?id=47914> (include
laplace symbol: laplace).
Implemented: *Bug 40436*
<https://bugs.documentfoundation.org/show_bug.cgi?id=40436> (custom math
colors: color rgb r g b)
Prepared implementation: *Bug 49990*
<https://bugs.documentfoundation.org/show_bug.cgi?id=49990> (include setP,
but for some reason does not render the symbol: setP)
Prepared implementation: *Bug 81267*
<https://bugs.documentfoundation.org/show_bug.cgi?id=81267> (repeat
operator, but for some reason does not render the symbol: repeat)
Prepared implementation: mathbb as font for double stroke, but not implem
ented.
Prepared implementation: script as font for script, but not implemented.

*Also, could not implement changes on UI since don't know how works the UI
yet.*