If you’re scene doesn’t already have a Global Volume, right-click in the Hierarchy, select Volume, then select Global Volume.
Select your Global Volume and look in the Inspector.
If your Global Volume says “None (Volume Profile)” then you do not have a volume profile defined. Click the New button to create one.
Now it should say “Global Volume Profile (Volume Profile)”. Double-click on it to open the profile.
Use the Add Override button to add Tonemapping and Bloom under Post-processing.
Click the checkbox for Tonemapping > Mode. Now set the dropdownbox to ACES.
Click the checkbox for Bloom > Threshold and set it to 0.66.
Click the checkbox for Bloom > Intensity and set it to 1.34.
Click the checkbox for Bloom > Scatter and leave at the default of 0.7.
Now, select the MainCamera in your scene. Scroll down to Rendering. Check the box to turn on Post Processing. I also like to turn on Anti-aliasing.
That’s all folks!