The company must already have at least one shareholder. If it does not, the wizard stops with "No shareholders available" and tells you to exit and add one or more shareholders to this company — either manually or via past events. So: shareholders first.

Decide in advance how subscribers will be added. The two paths diverge from that point:

Select manually — you pick the shareholders, then configure their transactions afterwards on the dashboard (A8.3).
Bulk import transactions — you upload a file, and the shareholders it names are added along with their transactions (A8.4).

You need Project Editor rights or above.

Steps

From the project Dashboard, select Start a Subscription. Subscription Process Setup opens.
On Event Name, enter the name the event will carry once the process completes — for example Wave 1.
Select Next to reach Choose Shareholders.
Under How to add shareholders, choose Select manually or Bulk import transactions.
Complete that step according to the path you chose.
Next through Review Shareholders — the shareholders that will take part.
Next through Process Overview — the workflow and its tracking stages.
On Confirm & Launch, read the Process Summary: how many shareholders the process covers, and the stages ahead.
Select Start Process and wait for Creating the process… to finish. You land on the Subscription Dashboard.

One name, three places

Event Name at step 2 is the only name the wizard asks for, and it does three jobs:

It becomes the event written into each participating company's history when the process finishes (A8.14). That is a permanent record, so name it the way you would want to read it in a year.
It heads that event's column in the cap table, in the Timeline and Compare views (A5.8, A5.9).
It becomes the process's Subscription Label — how the team picks this process out on the dashboard and under Active Operations while it is running.

The label stays editable on the subscription dashboard afterwards, and editing it changes the running process's label alone: the event keeps the name it was given. Unless you have a reason for them to differ, leaving them identical is easier to follow.

What good looks like

The Subscription Dashboard opens with the five stages across the top and the shareholders you selected carried into it, labelled with the name you entered. Nothing has been sent to any shareholder.

Common problems

"No shareholders available." The company has no shareholders yet. Leave the wizard, add them — manually or by recording a past event — then start again.

You are unsure which mode to pick. If you already have the transactions in a spreadsheet, bulk import saves the most work and is more reliable, because the file also carries the amounts. If you are setting up a handful of subscribers whose transactions you will configure by hand anyway, manual selection is simpler.

You picked the wrong mode. Exit and start the wizard again rather than trying to correct it downstream — nothing is created until Start Process.