standard EADG tuning.
wait until after the guitar does it's intro:
intro x1
E----------------22222222222222220000000000000000-----------------|
A2222222222222222--------------------------------2222222222222222-|
D-----------------------------------------------------------------|
G-----------------------------------------------------------------|
verse1 x2
E----------------22222222222222220000000000000000-|
A2222222222222222---------------------------------|
D-------------------------------------------------|
G-------------------------------------------------|
[ Tab from: https://www.guitartabs.cc/tabs/c/coldplay/yellow_btab_ver_8.html ]
E----------------22222222222222220000000000000000-------------------------| x1
A2222222222222222--------------------------------2222222222222222---------|
D-------------------------------------------------------------------------|
G-------------------------------------------------------------------------|
chorus1 x2
E------------------------------------------------|
A2-2---------------------------------------------|
D---1-1------4444--------------------------------|
G------4-1111------------------------------------|
Then repeat once, hope you find this helpful