the positioning of + operator is important when using ggplot (similar rules as to the magrittr pipe %>%)
for the statements to be connected the + should have content to the left of it.
Your code has a line starting with + so it doesnt connect.
try
ggplot(data=penguins)+
geom_point(mapping=aes(x=flipper_length_mm,
y= body_mass_g,
color=species)) +
facet_wrap(~species)