JS libraries (choose network, tokens, store/read/change data etc.)

Technical support
1

Hello colleagues!
My purpose is to save some data X inside the blockchain and then read and “change” it.
Could someone explain what is technically mean if I send ‘data’ transaction more that once:

const { data } = require(‘waves-transactions’)
const signedDataTx = data(previousSignedDataTx)

Can I use this way to save my data inside the blockchain and then ‘change’ it multiple times?
Can I see the data transaction history for corresponding account?

Also, I want to create my own token. I’ve called:

 const generator = require('@waves/signature-generator');
 const transactions = require('@waves/waves-transactions');
 generator.config.set({ networkByte: generator.TESTNET_BYTE }); 
 const issueData = {
       name: 'TEST',
       description: 'TEST description',
       quantity: 10000000000,
       precision: 0,
       reissuable: true,// additional emission is possible
       timestamp: Date.now()
 };
 const signedIssueTx = transactions.issue(issueData, seedMain);

but I do not see any tokens and transaction here (for my ‘seedMain’ account):
https://testnet.wavesplatform.com/wallet/transactions
What I did wrong?