Same as Tammo and Tpartner.
For me the ideal scenario is the one that Tammo mentions: The link already contains the token, there is no screen in between and the respondent goes directly to the survey, without even having to input the token anywhere (less explenation, less problems).
However, it seems that you want to have some kind of marketing text on the first page, then a page where you need to put the token. It is a weird constallation, but Limesurvey is used for the weirdest things...
If you don't require the respondents to put the token by hand, then I would put it directly into the link, then the welcom message can contain whatever you want. If you really want them to put some kind of code, you could always create a custom attribute and provide them with a "second token", which they need to put into a text question after the welcome text, which is validated against this custom attribute in the token table.
I answer at the LimeSurvey forum in my spare time, I'm not a LimeSurvey GmbH employee.
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